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Stock-Based Compensation - Additional Information (Detail) (USD $)
6 Months Ended 30 Months Ended 1 Months Ended
Jun. 30, 2014
Jun. 30, 2014
Restricted Stock [Member]
Jun. 30, 2014
2013 Stock Plan [Member]
Jun. 30, 2014
2013 Stock Plan [Member]
Nov. 30, 2013
2013 Stock Plan [Member]
Board of Directors [Member]
Nov. 30, 2013
2013 Stock Plan [Member]
Board of Directors [Member]
Maximum [Member]
Nov. 30, 2013
2013 Stock Plan [Member]
Board of Directors [Member]
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, capital shares reserved for future issuance 11,979,614       3,605,495    
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term         10 years    
Share-based compensation arrangement by share-based payment award, options, grants in period, gross     7,167,585        
Share-based compensation arrangement by share-based payment award, options, forfeitures in period     424,170        
Employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options     $ 4,678,804 $ 4,678,804      
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition     1 year 7 months 6 days        
Non-employee service share-based compensation, nonvested awards, compensation not yet recognized, stock options     594,103        
Non employee service share based compensation nonvested awards total compensation cost not yet recognized period for recognition1       1,380,903      
Share-based compensation arrangement by share-based payment award, options, vested, number of shares     2,730,198        
Share-based compensation arrangement by share-based payment award, award vesting period           5 years 1 year
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value   1,576,042          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value   685,284          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   $ 113,187